# encoding: utf-8
side1=float(input("the first side of triangle:"))
side2=float(input("the second side of triangle:"))
side3=float(input("the thrid side of triangle:"))
if(side1+side2>side3)and(side2+side3>side1)and(side3+side1>side2):
  print(side1,side2,side3,"is sides of triangle")
else:
  print(side1,side2,side3,"is not sides of triangle")